org.hsqldb/hsqldb/2.5.0 : org/hsqldb/jdbc/JDBCResultSetMetaData.java

JDBCResultSetMetaData
http://hsqldb.org: HSQLDB - Lightweight 100% Java SQL Database Engine (The HSQL Development Group)
HSQLDB License, a BSD open source license
Blaine Simpson
/* Copyright (c) 2001-2019, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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package org.hsqldb.jdbc;

import java.sql.ResultSetMetaData;
import java.sql.SQLException;

import org.hsqldb.error.ErrorCode;
import org.hsqldb.result.ResultMetaData;
import org.hsqldb.types.IntervalType;
import org.hsqldb.types.Type;
import org.hsqldb.types.Types;

/* $Id: JDBCResultSetMetaData.java 5968 2019-04-27 12:55:27Z fredt $ */

// fredt@users    - 20040412 - removed DITypeInfo dependencies
// campbell-burnet@users - 200404xx - removed unused imports;refinement for better
//                             usability of getColumnDisplaySize;
//                             javadoc updates
// campbell-burnet@users - 20051207 - patch 1.8.0.x initial JDBC 4.0 support work
// campbell-burnet@users - 20060522 - doc   1.9.0 full synch up to Mustang Build 84
// fredt@users - 1.9.0 usage of types and new ResultMetadata and ColumnMetaData
// Revision 1.15  2006/07/12 12:29:42  boucherb
// patch 1.9.0
// - full synch up to Mustang b90
// - minor update to toString


An object that can be used to get information about the types
and properties of the columns in a ResultSet object.
The following code fragment creates the ResultSet object rs,
creates the ResultSetMetaData object rsmd, and uses rsmd
to find out how many columns rs has and whether the first column in rs
can be used in a WHERE clause.
    ResultSet rs = stmt.executeQuery("SELECT a, b, c FROM TABLE2");
    ResultSetMetaData rsmd = rs.getMetaData();
    int numberOfColumns = rsmd.getColumnCount();
    boolean b = rsmd.isSearchable(1);




HSQLDB-Specific Information:
 
HSQLDB supports a subset of the ResultSetMetaData interface.

The JDBC specification for ResultSetMetaData is in part very
vague. This causes potential incompatibility between interpretations of the
specification as realized in different JDBC driver implementations. As such,
deciding to what degree reporting ResultSetMetaData is accurate has been
considered very carefully. Hopefully, the design decisions made in light of
these considerations have yeilded precisely the subset of full
ResultSetMetaData support that is most commonly needed and that is most
important, while also providing, under the most common use-cases, the
fastest access with the least overhead and the best comprimise between
speed, accuracy, jar-footprint and retention of JDBC resources. 

(fredt@users) 

(campbell-burnet@users)



Author: Campbell Burnet (campbell-burnet@users dot sourceforge.net), Fred Toussi (fredt@users dot sourceforge.net)
See Also: JDBCStatement.executeQuery
JDBCStatement.getResultSet
ResultSetMetaData
Version: 2.2.6/**
 * <!-- start generic documentation -->
 * An object that can be used to get information about the types
 * and properties of the columns in a <code>ResultSet</code> object.
 * The following code fragment creates the <code>ResultSet</code> object rs,
 * creates the <code>ResultSetMetaData</code> object rsmd, and uses rsmd
 * to find out how many columns rs has and whether the first column in rs
 * can be used in a <code>WHERE</code> clause.
 * <PRE>
 *
 *     ResultSet rs = stmt.executeQuery("SELECT a, b, c FROM TABLE2");
 *     ResultSetMetaData rsmd = rs.getMetaData();
 *     int numberOfColumns = rsmd.getColumnCount();
 *     boolean b = rsmd.isSearchable(1);
 *
 * </PRE>
 * <!-- end generic documentation -->
 *
 * <!-- start Release-specific documentation -->
 * <div class="ReleaseSpecificDocumentation">
 * <h3>HSQLDB-Specific Information:</h3> <p>
 *
 * HSQLDB supports a subset of the <code>ResultSetMetaData</code> interface.<p>
 *
 * The JDBC specification for <code>ResultSetMetaData</code> is in part very
 * vague. This causes potential incompatibility between interpretations of the
 * specification as realized in different JDBC driver implementations. As such,
 * deciding to what degree reporting ResultSetMetaData is accurate has been
 * considered very carefully. Hopefully, the design decisions made in light of
 * these considerations have yeilded precisely the subset of full
 * ResultSetMetaData support that is most commonly needed and that is most
 * important, while also providing, under the most common use-cases, the
 * fastest access with the least overhead and the best comprimise between
 * speed, accuracy, jar-footprint and retention of JDBC resources. <p>
 *
 * (fredt@users) <br>
 * (campbell-burnet@users)<p>
 * </div>
 * <!-- end release-specific documentation -->
 *
 * @author Campbell Burnet (campbell-burnet@users dot sourceforge.net)
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 2.2.6
 * @see JDBCStatement#executeQuery
 * @see JDBCStatement#getResultSet
 * @see java.sql.ResultSetMetaData
 */
public class JDBCResultSetMetaData implements ResultSetMetaData {

    
Returns the number of columns in this ResultSet object.

Throws: SQLException – if a database access error occurs
Returns: the number of columns/**
     * <!-- start generic documentation -->
     * Returns the number of columns in this <code>ResultSet</code> object.
     *
     * <!-- end generic documentation -->
     * @return the number of columns
     * @exception SQLException if a database access error occurs
     */
    public int getColumnCount() throws SQLException {
        return resultMetaData.getColumnCount();
    }

    
Indicates whether the designated column is automatically numbered.
(JDBC4 deleted:)[, thus read-only.]



HSQLDB-Specific Information:
 
HSQLDB 2.0 fully supports SQL Satandard features T174 and T176 that
define identity column support.

However, it must be stated here that contrary to the generic
documentation previous to the JDBC4 specification, HSQLDB automatically
numbered columns (IDENTITY columns, in HSQLDB parlance) are not
read-only. 
In fact, the generic documentation previous to the JDBC4 specification
seems to contradict the general definition of what, at minimum,
an auto-increment column is: 

Simply, an auto-increment column is one that guarantees it has a
autogenerated value after a successful insert or update operation,
even if no value is supplied, or DEFAULT is specified.



Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: true if so; false otherwise/**
     * <!-- start generic documentation -->
     * Indicates whether the designated column is automatically numbered.
     * <p>(JDBC4 deleted:)[, thus read-only.]
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * HSQLDB 2.0 fully supports SQL Satandard features T174 and T176 that
     * define identity column support.
     *
     * <hr>
     *
     * However, it must be stated here that contrary to the generic
     * documentation previous to the JDBC4 specification, HSQLDB automatically
     * numbered columns (IDENTITY columns, in HSQLDB parlance) are not
     * read-only. <p>
     *
     * In fact, the generic documentation previous to the JDBC4 specification
     * seems to contradict the general definition of what, at minimum,
     * an auto-increment column is: <p>
     *
     * Simply, an auto-increment column is one that guarantees it has a
     * autogenerated value after a successful insert or update operation,
     * even if no value is supplied, or DEFAULT is specified.<p>
     *
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean isAutoIncrement(int column) throws SQLException {

        checkColumn(column);

        return resultMetaData.columns[--column].isIdentity();
    }

    
Indicates whether a column's case matters.



HSQLDB-Specific Information:
 
HSQLDB 1.7.1 did not report this value accurately.  

Starting with 1.7.2, this feature is better supported.  

This method returns true for any column whose data type is a character
type, with the exception of VARCHAR_IGNORECASE for which it returns
false. It also returns false for any column whose data type is a
not a character data type. 



Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: true if so; false otherwise/**
     * <!-- start generic documentation -->
     * Indicates whether a column's case matters.
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * HSQLDB 1.7.1 did not report this value accurately.  <p>
     *
     * Starting with 1.7.2, this feature is better supported.  <p>
     *
     * This method returns true for any column whose data type is a character
     * type, with the exception of VARCHAR_IGNORECASE for which it returns
     * false. It also returns false for any column whose data type is a
     * not a character data type. <p>
     *
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean isCaseSensitive(int column) throws SQLException {

        checkColumn(column);

        Type type = translateType(resultMetaData.columnTypes[--column]);

        if (type.isCharacterType()) {
            return type.getCollation().isCaseSensitive();
        }

        return false;
    }

    
Indicates whether the designated column can be used in a where clause.



HSQLDB-Specific Information:
 
HSQLDB 2.0 handles this differently from previous versions. 

If the column in question is a database table or view column, and the
type of the column allows searching, then returns true, otherwise false.


Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: true if so; false otherwise/**
     * <!-- start generic documentation -->
     * Indicates whether the designated column can be used in a where clause.
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * HSQLDB 2.0 handles this differently from previous versions. <p>
     *
     * If the column in question is a database table or view column, and the
     * type of the column allows searching, then returns true, otherwise false.
     *
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean isSearchable(int column) throws SQLException {

        checkColumn(column);

        return resultMetaData.columns[--column].isSearchable();
    }

    
Indicates whether the designated column is a cash value.



HSQLDB-Specific Information:
 
HSQLDB 2.0 fully supports this feature and returns true for
NUMERIC and DECIMAL columns. 



Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: true if so; false otherwise/**
     * <!-- start generic documentation -->
     * Indicates whether the designated column is a cash value.
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * HSQLDB 2.0 fully supports this feature and returns true for
     * NUMERIC and DECIMAL columns. <p>
     *
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean isCurrency(int column) throws SQLException {

        checkColumn(column);

        Type type = translateType(resultMetaData.columnTypes[--column]);

        return (type.typeCode == Types.SQL_DECIMAL
                || type.typeCode == Types.SQL_NUMERIC) && type.scale > 0;
    }

    
Indicates the nullability of values in the designated column.



HSQLDB-Specific Information:
 
HSQLDB 2.2 fully supports this feature.  

columnNoNulls is always returned for result set columns
that represent constants, sequences or table columns known
to be not null. columnNullable is returned for NULL constants,
or nullable table columns. columnNullableUnknown is returned
for all other columns such as aggregates and computed values.

To determine the nullable status of a table column in isolation from
ResultSetMetaData and in a DBMS-independent fashion, the
DatabaseMetaData.getColumns() method can be invoked with the
appropriate filter values and the result should be inspected at the
position described in the DatabaseMetaData.getColumns() API
documentation.


Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: the nullability status of the given column; one of columnNoNulls,
         columnNullable or columnNullableUnknown/**
     * <!-- start generic documentation -->
     * Indicates the nullability of values in the designated column.
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * HSQLDB 2.2 fully supports this feature.  <p>
     *
     * <tt>columnNoNulls</tt> is always returned for result set columns
     * that represent constants, sequences or table columns known
     * to be not null. <tt>columnNullable</tt> is returned for NULL constants,
     * or nullable table columns. <tt>columnNullableUnknown</tt> is returned
     * for all other columns such as aggregates and computed values.<p>
     *
     * To determine the nullable status of a table column in isolation from
     * ResultSetMetaData and in a DBMS-independent fashion, the
     * DatabaseMetaData.getColumns() method can be invoked with the
     * appropriate filter values and the result should be inspected at the
     * position described in the DatabaseMetaData.getColumns() API
     * documentation.
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return the nullability status of the given column; one of <code>columnNoNulls</code>,
     *          <code>columnNullable</code> or <code>columnNullableUnknown</code>
     * @exception SQLException if a database access error occurs
     */
    public int isNullable(int column) throws SQLException {

        checkColumn(column);

        return resultMetaData.columns[--column].getNullability();
    }

    
Indicates whether values in the designated column are signed numbers.



HSQLDB-Specific Information:
 
HSQLDB 2.0 fully supports this feature.  



Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: true if so; false otherwise/**
     * <!-- start generic documentation -->
     * Indicates whether values in the designated column are signed numbers.
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * HSQLDB 2.0 fully supports this feature.  <p>
     *
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean isSigned(int column) throws SQLException {

        checkColumn(column);

        Type type = translateType(resultMetaData.columnTypes[--column]);

        return type.isNumberType();
    }

    
Indicates the designated column's normal maximum width in characters.



HSQLDB-Specific Information:
 
HSQLDB 2.0 fully supports this feature.  

The current calculation follows these rules:

Long character types and datetime types:
    The maximum length/precision, repectively.
CHAR and VARCHAR types:
     
      If the result set column is a direct pass through of a table
          column value and column size was declared, then the declared
          value is returned.
     
 Otherwise, the computed length according to SQL Standard is
          returned. For very large values, the value of the system property
          hsqldb.max_xxxchar_display_size or the magic value
          32766 (0x7FFE) (tested usable/accepted by most tools and
          compatible with assumptions made by java.io read/write
          UTF) when the system property is not defined or is not
          accessible, due to security constraints. 
     
     It must be noted that the latter value in no way affects the
     ability of the HSQLDB JDBC driver to retrieve longer values
     and serves only as the current best effort at providing a
     value that maximizes usability across a wide range of tools,
     given that the HSQLDB database engine allows very large
     lengths to be declared.
Number types: 
    The max precision, plus the length of the negation character (1),
    plus (if applicable) the maximum number of characters that may
    occupy the exponent character sequence.  Note that some legacy tools
    do not correctly handle BIGINT values of greater than 18 digits.
BOOLEAN type: 
    The length of the character sequence "false" (5), the longer of the
    two boolean value String representations.
Remaining types: 
    The maximum length/precision, respectively, as reported by
    DatabaseMetaData.getTypeInfo(), when applicable.  If the maximum
    display size is unknown, unknowable or inapplicable, then zero is
    returned. 




Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: the normal maximum number of characters allowed as the width
         of the designated column/**
     * <!-- start generic documentation -->
     * Indicates the designated column's normal maximum width in characters.
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * HSQLDB 2.0 fully supports this feature.  <p>
     *
     * The current calculation follows these rules:
     *
     * <ol>
     * <li>Long character types and datetime types:<p>
     *
     *     The maximum length/precision, repectively.
     *
     * <li>CHAR and VARCHAR types:
     *
     *      <ul>
     *      <li> If the result set column is a direct pass through of a table
     *           column value and column size was declared, then the declared
     *           value is returned.
     *
     *      <li> Otherwise, the computed length according to SQL Standard is
     *           returned. For very large values, the value of the system property
     *           hsqldb.max_xxxchar_display_size or the magic value
     *           32766 (0x7FFE) (tested usable/accepted by most tools and
     *           compatible with assumptions made by java.io read/write
     *           UTF) when the system property is not defined or is not
     *           accessible, due to security constraints. <p>
     *
     *      </ul>
     *
     *      It must be noted that the latter value in no way affects the
     *      ability of the HSQLDB JDBC driver to retrieve longer values
     *      and serves only as the current best effort at providing a
     *      value that maximizes usability across a wide range of tools,
     *      given that the HSQLDB database engine allows very large
     *      lengths to be declared.
     *
     * <li>Number types: <p>
     *
     *     The max precision, plus the length of the negation character (1),
     *     plus (if applicable) the maximum number of characters that may
     *     occupy the exponent character sequence.  Note that some legacy tools
     *     do not correctly handle BIGINT values of greater than 18 digits.
     *
     * <li>BOOLEAN type: <p>
     *
     *     The length of the character sequence "false" (5), the longer of the
     *     two boolean value String representations.
     *
     * <li>Remaining types: <p>
     *
     *     The maximum length/precision, respectively, as reported by
     *     DatabaseMetaData.getTypeInfo(), when applicable.  If the maximum
     *     display size is unknown, unknowable or inapplicable, then zero is
     *     returned. <p>
     *
     * </ol>
     *
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return the normal maximum number of characters allowed as the width
     *          of the designated column
     * @exception SQLException if a database access error occurs
     */
    public int getColumnDisplaySize(int column) throws SQLException {

        checkColumn(column);

        Type type = translateType(resultMetaData.columnTypes[--column]);

        return type.displaySize();
    }

    
Gets the designated column's suggested title for use in printouts and
displays. (JDBC4 clarification:) The suggested title is usually specified by the SQL AS
clause.  If a SQL AS is not specified, the value returned from
getColumnLabel will be the same as the value returned by the
getColumnName method.



HSQLDB-Specific Information:
 
In HSQLDB, a ResultSet column label is determined using the
following order of precedence:

The label (alias) specified in the generating query.
The name of the underlying column, if no label is specified.

C1, C2, etc. for computed columns that have no label.
 


Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: the suggested column title/**
     * <!-- start generic documentation -->
     * Gets the designated column's suggested title for use in printouts and
     * displays. (JDBC4 clarification:) The suggested title is usually specified by the SQL <code>AS</code>
     * clause.  If a SQL <code>AS</code> is not specified, the value returned from
     * <code>getColumnLabel</code> will be the same as the value returned by the
     * <code>getColumnName</code> method.
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * In HSQLDB, a <code>ResultSet</code> column label is determined using the
     * following order of precedence:
     *
     * <OL>
     * <LI>The label (alias) specified in the generating query.</LI>
     * <LI>The name of the underlying column, if no label is specified.<br>
     * <LI>C1, C2, etc. for computed columns that have no label.</LI>
     * </OL> <p>
     *
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return the suggested column title
     * @exception SQLException if a database access error occurs
     */
    public String getColumnLabel(int column) throws SQLException {

        checkColumn(column--);

        String label = resultMetaData.columnLabels[column];

        if (label != null && label.length() > 0) {
            return label;
        }

        return resultMetaData.columns[column].getNameString();
    }

    
Get the designated column's name.



HSQLDB-Specific Information:
 
In HSQLDB, a ResultSet column name is determined using the following
order of precedence:

The name of the underlying column, if the ResultSet column
  represents a column in a table.
The label or alias specified in the generating query.
C1, C2, etc. for computed columns that have no label.
 
If the jdbc.get_column_name property of the JDBC Connection has been set to false, this method returns the same value as getColumnLabel(int).



Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: column name/**
     * <!-- start generic documentation -->
     * Get the designated column's name.
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * In HSQLDB, a ResultSet column name is determined using the following
     * order of precedence:
     *
     * <OL>
     * <LI>The name of the underlying column, if the ResultSet column
     *   represents a column in a table.</LI>
     * <LI>The label or alias specified in the generating query.</LI>
     * <LI>C1, C2, etc. for computed columns that have no label.</LI>
     * </OL> <p>
     *
     * If the <code>jdbc.get_column_name</code> property of the JDBC Connection
     * has been set to false, this method returns the same value as
     * {@link #getColumnLabel(int)}.<p>
     *
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return column name
     * @exception SQLException if a database access error occurs
     */
    public String getColumnName(int column) throws SQLException {

        checkColumn(column--);

        if (useColumnName) {
            String name = resultMetaData.columns[column].getNameString();

            if (name != null && name.length() > 0) {
                return name;
            }
        }

        String label = resultMetaData.columnLabels[column];

        return label == null ? resultMetaData.columns[column].getNameString()
                             : label;
    }

    
Get the designated column's table's schema.



HSQLDB-Specific Information:
 
Since 1.8.0.x, HSQLDB implements standard SQL SCHEMA support;
this method returns the actual schema of the column's table.
Columns generated in queries have no schema name.


Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: schema name or "" if not applicable/**
     * <!-- start generic documentation -->
     * Get the designated column's table's schema.
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * Since 1.8.0.x, HSQLDB implements standard SQL SCHEMA support;
     * this method returns the actual schema of the column's table.
     * Columns generated in queries have no schema name.
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return schema name or "" if not applicable
     * @exception SQLException if a database access error occurs
     */
    public String getSchemaName(int column) throws SQLException {

        checkColumn(column);

        String name = resultMetaData.columns[--column].getSchemaNameString();

        return name == null ? ""
                            : name;
    }

    
(JDBC4 clarification:)
Get the designated column's specified column size.
For numeric data, this is the maximum precision.  For character data, this is the [maximum] length in characters.
For datetime datatypes, this is the [maximum] length in characters of the String representation (assuming the
maximum allowed precision of the fractional seconds component). For binary data, this is the [maximum] length in bytes.  For the ROWID datatype,
this is the length in bytes[, as returned by the implementation-specific java.sql.RowId.getBytes() method]. 0 is returned for data types where the
column size is not applicable.



HSQLDB-Specific Information:
 
HSQLDB 2.0 reports the correct length or precision for
all columns. For DOUBLE, the binary precision of 64 is returned, while
for other numeric types the decimal precision is returned.



Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: precision/**
     * <!-- start generic documentation -->
     * (JDBC4 clarification:)
     * Get the designated column's specified column size.
     * For numeric data, this is the maximum precision.  For character data, this is the [maximum] length in characters.
     * For datetime datatypes, this is the [maximum] length in characters of the String representation (assuming the
     * maximum allowed precision of the fractional seconds component). For binary data, this is the [maximum] length in bytes.  For the ROWID datatype,
     * this is the length in bytes[, as returned by the implementation-specific java.sql.RowId.getBytes() method]. 0 is returned for data types where the
     * column size is not applicable.
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * HSQLDB 2.0 reports the correct length or precision for
     * all columns. For DOUBLE, the binary precision of 64 is returned, while
     * for other numeric types the decimal precision is returned.<p>
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return precision
     * @exception SQLException if a database access error occurs
     */
    public int getPrecision(int column) throws SQLException {

        checkColumn(column);

        // type in columnTypes overrides column type
        Type type      = translateType(resultMetaData.columnTypes[--column]);
        return type.getJDBCPrecision();
    }

    
Gets the designated column's number of digits to right of the decimal point.
0 is returned for data types where the scale is not applicable.



HSQLDB-Specific Information:
 
HSQLDB 2.0 reports the correct scale for all columns.

For datetime and interval types such as Timestamp or Time, the
fractional second precision is reported.

The reported scale for INTEGER, BIGINT and DOUBLE is 0



Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: scale/**
     * <!-- start generic documentation -->
     * Gets the designated column's number of digits to right of the decimal point.
     * 0 is returned for data types where the scale is not applicable.
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * HSQLDB 2.0 reports the correct scale for all columns.<p>
     *
     * For datetime and interval types such as Timestamp or Time, the
     * fractional second precision is reported.<p>
     *
     * The reported scale for INTEGER, BIGINT and DOUBLE is 0<p>
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return scale
     * @exception SQLException if a database access error occurs
     */
    public int getScale(int column) throws SQLException {

        checkColumn(column);

        Type type = translateType(resultMetaData.columnTypes[--column]);

        return type.getJDBCScale();
    }

    
Gets the designated column's table name.

Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: table name or "" if not applicable/**
     * <!-- start generic documentation -->
     * Gets the designated column's table name.
     *
     * <!-- end generic documentation -->
     * @param column the first column is 1, the second is 2, ...
     * @return table name or "" if not applicable
     * @exception SQLException if a database access error occurs
     */
    public String getTableName(int column) throws SQLException {

        checkColumn(column);

        String name = resultMetaData.columns[--column].getTableNameString();

        return name == null ? ""
                            : name;
    }

    
Gets the designated column's table's catalog name.



HSQLDB-Specific Information:
 
From 2.0, HSQLDB returns the name of the catalog. The default name is
PUBLIC.
This value can be changed for the database using an SQL command.

HSQLDB supports use of catalog qualification in DLL or DML when it is
allowed by the Standard. 

However, not all clients respect the SQL Standard and may use a
catalog qualifier in a context where it is not supported by the Standard.
 For greater detail, see discussion at: JDBCDatabaseMetaData. 



Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: the name of the catalog for the table in which the given column
         appears or "" if not applicable/**
     * <!-- start generic documentation -->
     * Gets the designated column's table's catalog name.
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * From 2.0, HSQLDB returns the name of the catalog. The default name is
     * PUBLIC.
     * This value can be changed for the database using an SQL command.<p>
     *
     * HSQLDB supports use of catalog qualification in DLL or DML when it is
     * allowed by the Standard. <p>
     *
     * However, not all clients respect the SQL Standard and may use a
     * catalog qualifier in a context where it is not supported by the Standard.
     * <p>
     *
     * For greater detail, see discussion at:
     * {@link JDBCDatabaseMetaData}. <p>
     *
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return the name of the catalog for the table in which the given column
     *          appears or "" if not applicable
     * @exception SQLException if a database access error occurs
     */
    public String getCatalogName(int column) throws SQLException {

        checkColumn(column);

        String name = resultMetaData.columns[--column].getCatalogNameString();

        return name == null ? ""
                            : name;
    }

    
Retrieves the designated column's SQL type.



HSQLDB-Specific Information:
 
This reports the SQL type code of the column. For time and timestamp
types that are WITH TIME ZONE, the values as the SQL Standard CLI
codes.



Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
See Also: Types
Returns: SQL type from java.sql.Types/**
     * <!-- start generic documentation -->
     * Retrieves the designated column's SQL type.
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * This reports the SQL type code of the column. For time and timestamp
     * types that are WITH TIME ZONE, the values as the SQL Standard CLI
     * codes.<p>
     *
     * </div>
     * <!-- end release-specific documentation -->
     *
     *
     * @param column the first column is 1, the second is 2, ...
     * @return SQL type from java.sql.Types
     * @exception SQLException if a database access error occurs
     * @see java.sql.Types
     */
    public int getColumnType(int column) throws SQLException {

        checkColumn(column);

        Type type = translateType(resultMetaData.columnTypes[--column]);

        return type.getJDBCTypeCode();
    }

    
Retrieves the designated column's database-specific type name.

Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: type name used by the database. If the column type is
a user-defined type, then a fully-qualified type name is returned./**
     * <!-- start generic documentation -->
     * Retrieves the designated column's database-specific type name.
     * <!-- end generic documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return type name used by the database. If the column type is
     * a user-defined type, then a fully-qualified type name is returned.
     * @exception SQLException if a database access error occurs
     */
    public String getColumnTypeName(int column) throws SQLException {

        checkColumn(column);

        Type type = translateType(resultMetaData.columnTypes[--column]);

        return type.getNameString();
    }

    
Indicates whether the designated column is definitely not writable.



HSQLDB-Specific Information:
 
From 2.0 this method returns true if the ResultSet is not updatable
or the column in question is not updatable.



Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: true if so; false otherwise/**
     * <!-- start generic documentation -->
     * Indicates whether the designated column is definitely not writable.
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * From 2.0 this method returns true if the ResultSet is not updatable
     * or the column in question is not updatable.<p>
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean isReadOnly(int column) throws SQLException {

        checkColumn(column);

        return !resultMetaData.columns[--column].isWriteable();
    }

    
Indicates whether it is possible for a write on the designated column to
succeed.



HSQLDB-Specific Information:
 
From 2.0 this method returns false if the ResultSet is not updatable
or the column in question is not updatable.



Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: true if so; false otherwise/**
     * <!-- start generic documentation -->
     * Indicates whether it is possible for a write on the designated column to
     * succeed.
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * From 2.0 this method returns false if the ResultSet is not updatable
     * or the column in question is not updatable.<p>
     *
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean isWritable(int column) throws SQLException {

        checkColumn(column);

        return resultMetaData.colIndexes != null
               && resultMetaData.colIndexes[--column] > -1;
    }

    
Indicates whether a write on the designated column will definitely succeed.



HSQLDB-Specific Information:
 
From 2.0 this method returns false if the ResultSet is not updatable
or the column in question is not updatable.



Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: true if so; false otherwise/**
     * <!-- start generic documentation -->
     * Indicates whether a write on the designated column will definitely succeed.
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * From 2.0 this method returns false if the ResultSet is not updatable
     * or the column in question is not updatable.<p>
     *
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean isDefinitelyWritable(int column) throws SQLException {

        checkColumn(column);

        return resultMetaData.colIndexes != null
               && resultMetaData.colIndexes[--column] > -1;
    }

    //--------------------------JDBC 2.0-----------------------------------

    
Returns the fully-qualified name of the Java class whose instances
are manufactured if the method ResultSet.getObject
is called to retrieve a value
from the column.  ResultSet.getObject may return a subclass of the
class returned by this method.



HSQLDB-Specific Information:
 
HSQLDB 2.0 fully supports this feature.

For columns of type OTHER, there is no specific class name and
java.lang.Object is returned.


Params: column – the first column is 1, the second is 2, ...
Throws: SQLException – if a database access error occurs
Returns: the fully-qualified name of the class in the Java programming
        language that would be used by the method
ResultSet.getObject to retrieve the value in the specified
column. This is the class name used for custom mapping.
Since: JDK 1.2/**
     * <!-- start generic documentation -->
     * <p>Returns the fully-qualified name of the Java class whose instances
     * are manufactured if the method <code>ResultSet.getObject</code>
     * is called to retrieve a value
     * from the column.  <code>ResultSet.getObject</code> may return a subclass of the
     * class returned by this method.
     * <!-- end generic documentation -->
     *
     * <!-- start Release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * HSQLDB 2.0 fully supports this feature.<p>
     *
     * For columns of type OTHER, there is no specific class name and
     * java.lang.Object is returned.
     *
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param column the first column is 1, the second is 2, ...
     * @return the fully-qualified name of the class in the Java programming
     *         language that would be used by the method
     * <code>ResultSet.getObject</code> to retrieve the value in the specified
     * column. This is the class name used for custom mapping.
     * @exception SQLException if a database access error occurs
     * @since JDK 1.2
     */
    public String getColumnClassName(int column) throws SQLException {

        checkColumn(column);

        Type type = translateType(resultMetaData.columnTypes[--column]);

        return type.getJDBCClassName();
    }

    //----------------------------- JDBC 4.0 -----------------------------------
    // ------------------- java.sql.Wrapper implementation ---------------------

    Returns an object that implements the given interface to allow access to
non-standard methods, or standard methods not exposed by the proxy.
If the receiver implements the interface then the result is the receiver
or a proxy for the receiver. If the receiver is a wrapper
and the wrapped object implements the interface then the result is the
wrapped object or a proxy for the wrapped object. Otherwise return the
the result of calling unwrap recursively on the wrapped object
or a proxy for that result. If the receiver is not a
wrapper and does not implement the interface, then an SQLException is thrown.
Params: iface – A Class defining an interface that the result must implement.
Throws: SQLException – If no object found that implements the interface
Returns: an object that implements the interface. May be a proxy for the actual implementing object.
Since: JDK 1.6/**
     * Returns an object that implements the given interface to allow access to
     * non-standard methods, or standard methods not exposed by the proxy.
     *
     * If the receiver implements the interface then the result is the receiver
     * or a proxy for the receiver. If the receiver is a wrapper
     * and the wrapped object implements the interface then the result is the
     * wrapped object or a proxy for the wrapped object. Otherwise return the
     * the result of calling <code>unwrap</code> recursively on the wrapped object
     * or a proxy for that result. If the receiver is not a
     * wrapper and does not implement the interface, then an <code>SQLException</code> is thrown.
     *
     * @param iface A Class defining an interface that the result must implement.
     * @return an object that implements the interface. May be a proxy for the actual implementing object.
     * @throws java.sql.SQLException If no object found that implements the interface
     * @since JDK 1.6
     */
    @SuppressWarnings("unchecked")
    public <T>T unwrap(java.lang.Class<T> iface) throws java.sql.SQLException {

        if (isWrapperFor(iface)) {
            return (T) this;
        }

        throw JDBCUtil.invalidArgument("iface: " + iface);
    }

    Returns true if this either implements the interface argument or is directly or indirectly a wrapper
for an object that does. Returns false otherwise. If this implements the interface then return true,
else if this is a wrapper then return the result of recursively calling isWrapperFor on the wrapped
object. If this does not implement the interface and is not a wrapper, return false.
This method should be implemented as a low-cost operation compared to unwrap so that
callers can use this method to avoid expensive unwrap calls that may fail. If this method
returns true then calling unwrap with the same argument should succeed.
Params: iface – a Class defining an interface.
Throws: SQLException –  if an error occurs while determining whether this is a wrapper
for an object with the given interface.
Returns: true if this implements the interface or directly or indirectly wraps an object that does.
Since: JDK 1.6/**
     * Returns true if this either implements the interface argument or is directly or indirectly a wrapper
     * for an object that does. Returns false otherwise. If this implements the interface then return true,
     * else if this is a wrapper then return the result of recursively calling <code>isWrapperFor</code> on the wrapped
     * object. If this does not implement the interface and is not a wrapper, return false.
     * This method should be implemented as a low-cost operation compared to <code>unwrap</code> so that
     * callers can use this method to avoid expensive <code>unwrap</code> calls that may fail. If this method
     * returns true then calling <code>unwrap</code> with the same argument should succeed.
     *
     * @param iface a Class defining an interface.
     * @return true if this implements the interface or directly or indirectly wraps an object that does.
     * @throws java.sql.SQLException  if an error occurs while determining whether this is a wrapper
     * for an object with the given interface.
     * @since JDK 1.6
     */
    public boolean isWrapperFor(
            java.lang.Class<?> iface) throws java.sql.SQLException {
        return (iface != null && iface.isAssignableFrom(this.getClass()));
    }

// ------------------------- Internal Implementation ---------------------------
    private ResultMetaData resultMetaData;

    Whether to use the underlying column name or label when reporting
getColumnName().
/**
     * Whether to use the underlying column name or label when reporting
     * getColumnName().
     */
    private boolean useColumnName;
    private boolean translateTTIType;
    private int     columnCount;

    Constructs a new JDBCResultSetMetaData object from the specified
JDBCResultSet and HsqlProprties objects.
Params: meta – the ResultMetaData object from which to construct a new
       JDBCResultSetMetaData object
Throws: SQLException – if a database access error occurs/**
     * Constructs a new JDBCResultSetMetaData object from the specified
     * JDBCResultSet and HsqlProprties objects.
     *
     * @param meta the ResultMetaData object from which to construct a new
     *        JDBCResultSetMetaData object
     * @throws SQLException if a database access error occurs
     */
    JDBCResultSetMetaData(ResultMetaData meta, boolean isUpdatable,
                          boolean isInsertable,
                          JDBCConnection conn) throws SQLException {
        init(meta, conn);
    }

     Initializes this JDBCResultSetMetaData object from the specified
 Result and HsqlProperties objects.
 @param meta the ResultMetaData object from which to initialize this
        JDBCResultSetMetaData object
 @param conn the JDBCConnection
 @throws SQLException if a database access error occurs
/**
     *  Initializes this JDBCResultSetMetaData object from the specified
     *  Result and HsqlProperties objects.
     *
     *  @param meta the ResultMetaData object from which to initialize this
     *         JDBCResultSetMetaData object
     *  @param conn the JDBCConnection
     *  @throws SQLException if a database access error occurs
     */
    void init(ResultMetaData meta, JDBCConnection conn) throws SQLException {

        resultMetaData = meta;
        columnCount    = resultMetaData.getColumnCount();

        // fredt -  props is null for internal connections, so always use the
        //          default behaviour in this case
        // JDBCDriver.getPropertyInfo says
        // default is true
        useColumnName = true;

        if (conn == null) {
            return;
        }

        useColumnName    = conn.isUseColumnName;
        translateTTIType = conn.isTranslateTTIType;
    }

    Performs an internal check for column index validity. 
Params: column – index of column to check
Throws: SQLException – when this object's parent ResultSet has
     no such column/**
     * Performs an internal check for column index validity. <p>
     *
     * @param column index of column to check
     * @throws SQLException when this object's parent ResultSet has
     *      no such column
     */
    private void checkColumn(int column) throws SQLException {

        if (column < 1 || column > columnCount) {
            throw JDBCUtil.sqlException(ErrorCode.JDBC_COLUMN_NOT_FOUND,
                                    String.valueOf(column));
        }
    }

    Translates an INTERVAL type to VARCHAR.
Removes time zone from datetime types.
/**
     * Translates an INTERVAL type to VARCHAR.
     * Removes time zone from datetime types.
     *
     */
    private Type translateType(Type type) {

        if (this.translateTTIType) {
            if (type.isIntervalType()) {
                type = ((IntervalType) type).getCharacterType();
            }
        }

        return type;
    }

    Returns a string representation of the object. 
The string consists of the name of the class of which the
object is an instance, the at-sign character `@',
the unsigned hexadecimal representation of the hash code of the
object and a comma-delimited list of this object's indexed attributes,
enclosed in square brackets.
Returns:  a string representation of the object./**
     * Returns a string representation of the object. <p>
     *
     * The string consists of the name of the class of which the
     * object is an instance, the at-sign character `<code>@</code>',
     * the unsigned hexadecimal representation of the hash code of the
     * object and a comma-delimited list of this object's indexed attributes,
     * enclosed in square brackets.
     *
     * @return  a string representation of the object.
     */
    public String toString() {

        StringBuilder sb = new StringBuilder();

        sb.append(super.toString());

        if (columnCount == 0) {
            sb.append("[columnCount=0]");

            return sb.toString();
        }
        sb.append('[');

        for (int i = 0; i < columnCount; i++) {
            JDBCColumnMetaData meta = getColumnMetaData(i + 1);

            sb.append('\n');
            sb.append("   column_");
            sb.append(i + 1);
            sb.append('=');
            sb.append(meta);

            if (i + 1 < columnCount) {
                sb.append(',');
                sb.append(' ');
            }
        }
        sb.append('\n');
        sb.append(']');

        return sb.toString();
    }

    JDBCColumnMetaData getColumnMetaData(int i) {

        JDBCColumnMetaData meta = new JDBCColumnMetaData();

        try {
            meta.catalogName          = getCatalogName(i);
            meta.columnClassName      = getColumnClassName(i);
            meta.columnDisplaySize    = getColumnDisplaySize(i);
            meta.columnLabel          = getColumnLabel(i);
            meta.columnName           = getColumnName(i);
            meta.columnType           = getColumnType(i);
            meta.isAutoIncrement      = isAutoIncrement(i);
            meta.isCaseSensitive      = isCaseSensitive(i);
            meta.isCurrency           = isCurrency(i);
            meta.isDefinitelyWritable = isDefinitelyWritable(i);
            meta.isNullable           = isNullable(i);
            meta.isReadOnly           = isReadOnly(i);
            meta.isSearchable         = isSearchable(i);
            meta.isSigned             = isSigned(i);
            meta.isWritable           = isWritable(i);
            meta.precision            = getPrecision(i);
            meta.scale                = getScale(i);
            meta.schemaName           = getSchemaName(i);
            meta.tableName            = getTableName(i);
        } catch (SQLException e) {
        }

        return meta;
    }
}
Author:	Campbell Burnet (campbell-burnet@users dot sourceforge.net), Fred Toussi (fredt@users dot sourceforge.net)
See Also:	JDBCStatement.executeQuery JDBCStatement.getResultSet ResultSetMetaData
Version:	2.2.6
Throws:	SQLException – if a database access error occurs
Returns:	the number of columns
Params:	column – the first column is 1, the second is 2, ...
Throws:	SQLException – if a database access error occurs
Returns:	`true` if so; `false` otherwise
Params:	iface – A Class defining an interface that the result must implement.
Throws:	SQLException – If no object found that implements the interface
Returns:	an object that implements the interface. May be a proxy for the actual implementing object.
Since:	JDK 1.6
Params:	iface – a Class defining an interface.
Throws:	SQLException – if an error occurs while determining whether this is a wrapper for an object with the given interface.
Returns:	true if this implements the interface or directly or indirectly wraps an object that does.
Since:	JDK 1.6
Params:	meta – the ResultMetaData object from which to construct a new JDBCResultSetMetaData object
Throws:	SQLException – if a database access error occurs
Params:	column – index of column to check
Throws:	SQLException – when this object's parent ResultSet has no such column
/

org.hsqldb/ hsqldb/ 2.5.0/ org/hsqldb/jdbc/JDBCResultSetMetaData.java

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